Revert of Standardize usage of virtual/override/final in ipc/

ipc/ipc_channel_factory.cc

Index: ipc/ipc_channel_factory.cc
diff --git a/ipc/ipc_channel_factory.cc b/ipc/ipc_channel_factory.cc
index 9bcaa75c3e75215e780b5b1d66a36752d281cc03..f553203b1238cdc8ff2b78f913714afd03b7e6fe 100644
--- a/ipc/ipc_channel_factory.cc
+++ b/ipc/ipc_channel_factory.cc
@@ -15,9 +15,12 @@
       : handle_(handle), mode_(mode) {
   }
 
-  std::string GetName() const override { return handle_.name; }
+  virtual std::string GetName() const override {
+    return handle_.name;
+  }
 
-  scoped_ptr<Channel> BuildChannel(Listener* listener) override {
+  virtual scoped_ptr<Channel> BuildChannel(
+      Listener* listener) override {
     return Channel::Create(handle_, mode_, listener);
   }